diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77082f7..8385131 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Changed
+- Updated [`new_mime_guess`] to 4.0.0
+### Fixed
+- Disabled [`smartstring`] test on unsupported architectures
 ### Other
 - Use [`parking_lot`]'s `RwLock` instead of the built-in one for a slight performance increase
 
@@ -283,6 +287,7 @@ Initial commit!
 [`new_mime_guess`]: https://crates.io/crates/new_mime_guess
 [`once_cell`]: https://crates.io/crates/once_cell
 [`parking_lot`]: https://crates.io/crates/parking_lot
+[`smartstring]: https://crates.io/crates/smartstring
 [`snailquote`]: https://crates.io/crates/snailquote
 [`structopt`]: https://crates.io/crates/structopt
 [`xdg-mime`]: https://crates.io/crates/xdg-mime
diff --git a/Cargo.lock b/Cargo.lock
index e773e72..cd942cf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -358,11 +358,10 @@ checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 
 [[package]]
 name = "new_mime_guess"
-version = "3.0.1"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b101054f57b10576d116bc0da7ce8b05362b4490b0d21c7748395eaaf9359047"
+checksum = "bb3253391c5e7939360b2f7f27c7e7821dbc1a0bdab65884dde484fd71132764"
 dependencies = [
- "bitflags",
  "mime",
  "phf",
  "phf_codegen",
diff --git a/Cargo.toml b/Cargo.toml
index 09df6ac..2ba2e3b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ json = ["serde", "serde_json"]
 walkdir = "~2.3.2"
 log = "0.4.14"
 mime = "0.3.16"
-mime_guess = { package = "new_mime_guess", features = ["phf-map"], version = "3.0.0" }
+mime_guess = { package = "new_mime_guess", features = ["phf-map"], version = "4.0.0" }
 snailquote = "0.3.0"
 once_cell = "1.8.0"
 rayon = { version = "1.5.0", optional = true }